Rudin and Kirby were in an area next to the fermentation room when the explosion occurred and were struck by a tank and other debris that came through a metal wall, according to the petition.

They allege that Wehrmann failed to ensure that the tank and associated equipment were inspected and operated properly. The suit goes on to say that Horn was working in the fermentation room on one of the tanks at the time.

The petition did not spell out whether Horn or anyone other than the two plaintiffs was injured.

Rudin and Kirby said they suffered injuries and damages, including medical expenses, loss of earnings, pain and anguish, physical impairment and disfigurement.

As seen in online videos and comments posted by people on the tour, the explosion sent a covering of beer across the plant floor.

Brewery officials did not immediately respond to a request for comment.

According to a recorded message at the business, tours take place each Saturday at 11 a.m. and last about two hours.